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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04582affac57f6ed964f4bd52d2f5c9b8ed75dc449d3c63422dac996749ba873' 
  AND token = '8r7La6dpD8yooczTyMJpokzPrs6G2tadEguqOdS6wzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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