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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4a433e01d24ea0ebbf265c03380a8fa1302cae42aa0cfbcc98a3b3e827f3246' 
  AND token = 'Y/7tHfUAycSskcwOGUN/ottRmBl1g+1DoUu8mZrdeKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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