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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25e8a18ba651a72156eed4ae7f828e6f46c5d071dc76f172c7db72852add5896' 
  AND token = 'lI1L6KX+CdXZMSwcMP5XKtIwO49FCB25uOqRKCgv8aI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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