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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ff97eb0a023cafffae511232ff29a5940ebcffa5dd1ca8d4fec33d127ad5f76' 
  AND token = '8eSnhKPrfXqbqh73gK0kFDknjyf1Chfe7Flfm8aR1fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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