SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cb3dd9f39370ec2e88e147e89e5cd68a6eb7885bffd09247346adfd110efcb2' 
  AND token = 'l8SAVh/1WU2nBPK6uWUGasgLmn9/PmXQkQJvQ4fq864=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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