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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93dc639d9a9bda17c4ee4b9632d21f151be0c0725083579127b83866ffbdb3ea' 
  AND token = 'Q9Annz6OWBkxOhkrexrfzMQVi+SytsMnJhEZ2yKABDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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