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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '434bddba4a1b6cb3697e9b83d29c885e294e71f8ce244b881d56e4c2ddf20e62' 
  AND token = 'FT6WAAHdrMrvwOuNQWOiGOeAZGmUgmppWyGYl7pbJp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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