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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4c51fd3cbbd329cfb41a4c65c7ac50bffc566e8c1afbadd6b8bbf9bd45544eb' 
  AND token = 'kovWM9OAvlFcRfGiQ6rhdRYUR2wKdS4zJyUD4hcISG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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