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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a82720e5c04d92e1c41766cbe178b127e0c90123964254cd52f5d137eb853963' 
  AND token = 'h9awP3EhLiuj6CQ3EjdIJEhYqzCbB3XBrspwzJdLJsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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