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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a13b6519c7d7ddd715d7a95c00fb7260bcea5535282dd70f074fdfb7d9c4f7f4' 
  AND token = 'Xii2frWc/or+SocinltLQUQn4daERGECDf35/CyfXEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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