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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83a19665e8ccdc8b224b7d0994605b248b6f15b13d8daf4776da3e7bb3137303' 
  AND token = 'sji6V4fG2nJ0+9rflJvn5H47IVV0XkaX6Iqly/HYcZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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