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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '062d48835a9d9e7a15ec551347d7543820f56fddf9a28185e809bf9750f6cb7c' 
  AND token = 'y6n7VLjOK0dF8ArLD7IEnBNYSesTnsEhMtLpbD/PiZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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