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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8c619cea0cf72a308f69743f3fdae7bf3abae04c29206c3f2791537f15226f2' 
  AND token = 'uOSpqf7o61KlybxQ7AhnijkR2pukR/wcaZv4xcxV/rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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