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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8850373fd5fde337307483543d94495ab7d5da14510647c556e320a08329786' 
  AND token = 'KGQaDPrVy6p4bbeVc5bap25wW4v8W8kMw4tjZf28Rmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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