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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13b91997a1845995657147704170c478950262a6a91f5404ad24e9a3602789fc' 
  AND token = 'N9fphZ4ICZ6Bi1LkXxo+icw2cF83fpXC08CjQBksur0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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