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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7757bac957201e073e9e54ae0c2ada5759c175be5712255bb4fc6911c79bb0b' 
  AND token = 'gt8fKc01OQH6L0La4Q03Na9mhjtkIQGmhyKBcEpUJ0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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