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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57db140f655e0e81c6c6833953233c71f1a76c9cce83229bb62ae82d0499d53f' 
  AND token = 'Fk5K6upO4WxntQLPrnD83mV8g4sB0YxqzBQ96+Y1WKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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