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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '233115700e344ecef37a63b9c872a9104dc71e019b4f6162301e22566f6af50b' 
  AND token = '1xhmjgINZkgYDiiuhqXHBaI+ejKk5Ey+T3WfiT/w6Fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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