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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2da006146d31a562d98fe61b657e855af6e4cdf07553a2b8ac2ca65110f5d55' 
  AND token = 'djAy6jdTpTywQWrIN395zUUPRQO5C7txH1I+ArRXPx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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