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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85ec088e3658bb62d51d41286ddc3e6eefff85f9b93f52969b44b16b32b086e4' 
  AND token = 'JB+cw0+WOYXHGf5mrZz2In2YBxSGfJ81viTs1vZ3TsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}