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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07333dbf9f364de472c861bca8fc5c50c6d1e95ab4e57db921b7ff99d5a4dec7' 
  AND token = '/ZROHDBhHzQbLQyab5Lski+tF2qF+EF14QcDv8iI6VM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00134

JSON explain

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