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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2965de553227eae0088637984c13be3ffd498ad739adf12794c140c742f4d2e0' 
  AND token = 'ngFjnhLjixG3umHr/FrZDLRd1BGVx/r5BRLMOesge7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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