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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3e154e9738f48c1a4d9e02675c0c03cb1531f2c72786628ef419a91492fb8cf' 
  AND token = 'hySoOIq46fwNZHefe9c8eenLEo/2cO41dfQ/FL0X+VE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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