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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bbd74c4d88d77022519e650c138579e556532465195e3bad3647664ab0ae3ff' 
  AND token = 'Ausde1LxLwf1zMeFefz9cfQ95HCyE1h8KL62wiMAsNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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