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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba7dcf5298a1d16e430b9f04bd2aeacb94cd3396fe052fe8431b3f4abbc314fd' 
  AND token = 'H57nh2Co94qU6lKqi5GAwAJS9JtDQrxqX4uZiNTl8TQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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