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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9defe40f5a70670b97700b96f6481a85ed8cfaf0d8efab5031b2638149755e89' 
  AND token = 'NHXyiz1Gm9fETyqDkMPfdJrxM6ghWtXDWLUNoRi/heU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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