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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '535591ebfebeebadc83f98e8deb889b3ca6b57833334bda92fbc5aa9efb07777' 
  AND token = 'sI2E1ZDzVgdqiQ0oN01jPyRbKl0cbjf1HRfEXBfbsGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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