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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb6203017f3b4ca1a84b013196700a586a356341c1d6b76807027e2246671beb' 
  AND token = 'fnajDtbXO9j2P72kL36TXIoV/7zAN70FMq28YEhNN08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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