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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad8d85a6b6b9e01dfbf58d2ffa49f9c93b05bfdd50b31cec417d7dac87de62d6' 
  AND token = 'sj7M25AaWthVYtt0D24eABzJfjrQSuWd73aJPz6Pw9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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