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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55b8687744b839be3d06681393ce9271d78275acb84ee4bb85a6047aa84e647b' 
  AND token = 'W5Q8QJr0/RSkQxVJ0tjp55UFnKKDR2NWr5V6FX2Q4bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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