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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6093205c3d7cb59f80840c6a84211d039a0d5ecdc080d35191081ac6ed26ab6' 
  AND token = 'vNCGBAM3ihxtbWdt9XFtgT0GwRuqFCGdQVzLoh4UmDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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