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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f7262e8189a2f88a7bbd62d6d646fa0589831e8b5f835f593f051ae57e0a582' 
  AND token = 'EC1g4mgFQ/8fMc8fDEFk+Ugsth8fGMBsTGfM9EnP4+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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