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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ba6cc0db921ef3e4daf4fb209d98a98cd348f11fbb3352e5578346e912776d6' 
  AND token = 'SF5ODUCAu7v4TXRxAXl2xpWQGuASoemdI9RREZfNTu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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