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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c504c3e83a3729b7634c028397ab06829a7bb7b079778ad1e8543d4230484a4f' 
  AND token = 'RS4ACMmDtvyu34sHuy83vzq63WVmYKb2Gn3FzgT70hA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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