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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd827591fc7f1e8539dfded7b6ac605c43fa77ec8634780fd4fe2b5b7bebfd73d' 
  AND token = 'HHrLibyMmpAJCI3lsfYgmwhsA7LTt1GAt3NlZnd07ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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