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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91514957be2a893217194a00c48acbdf5f4bc97951b5e510b5330c8266e9bb9a' 
  AND token = 'WR4KCnc5eLL1P9vxbACpwrTk0Mdoy7Rh6Q+QQjJd6Js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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