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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '411bd9c836d9caeb3c312afb64146b49e5d76f91e72482f4d26ecb07c2de1ae9' 
  AND token = 'kwXXqo7QDclI2243DMS8Ujsn8KHorfs2ljPPIOLaopY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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