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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e71f71288810cda8dca09fa3caee629023d5ba52643b13e4e810e21d86152b40' 
  AND token = 'xL1CEyor8FlGbm2yjpFP/2EnnIcl8iPnoHmt8Aaw/a8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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