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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf3adf34fa55b9eaa95551be6fbff59cbbd3c5841b8b48f6d2fb947cb267e98b' 
  AND token = '/ZFA/4KRelajtVogs+ZJu8Nkb1m1P0icoJcQDGqy4lQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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