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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aae69f93e3ae0a51aafc2ac5dee28ffe85890360c6f18b3a67199f421ba85a4f' 
  AND token = 'tdhP44J5f/+uKdg9nnSyR0LJ1KMNqxT0qPVA5heTKLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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