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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca981034dad1324368d224ca6bd950d967277ef282c34515f9d7307e26c8bc20' 
  AND token = '/ZuNwS/qRojbYF/5Iq1NjmyELUd9QYqo09JPwdggSF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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