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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b58a5a427f8cd4bfb4c8f76f31dc67af358771c272f14cecbec98b012a53d59c' 
  AND token = '2t1SJypbFu0Z8+SYRiVzZh6bj4yLpV8jndeFqjK9OSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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