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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a57d5998079eb939a755e1bbc0fddff4fccfe2cec99f6e5f7350467cae2e324b' 
  AND token = 'u5rmtP25T9v/5qG+UNKXbsqknfHp9QPq7HgcX5b6V+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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