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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '514efdb5f86a8a97d48c35ce35f7bd0772a0aaf53647be8acd50b117802f6dd1' 
  AND token = 'o4zeBIec8ivSoUoTK1nC8NQciWyZ/9NbRR/rTeF+BzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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