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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '029f5d5118668cb25b8e3a5a4e499b84e40b7b65f5d483df7aed42a4afb4db46' 
  AND token = 'y0e4yWd/A7Qsioa1GzGHGFW23SakhKkoiHLLU78zqG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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