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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a985fd254f71f859df260139b084b1dac85df3d21897fc738d0306d4aa3265ac' 
  AND token = '6uPtfXDzFtN3B9Sv8brmWpCJb63yAz0b2zOZJJZTwoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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