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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd33956ff69f68ad3640c0ef397094e11f214484eb04949175ee18ad6c31003a2' 
  AND token = '2VIe8td50JfCyTBEctXp8yGLz1NKCSFVGkC02jCE36o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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