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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00310d50c2d82ae6c921d92032965295abff7c80ad626078d0f7d2366261077d' 
  AND token = '1JClh2IDTYhJ8OohoD8qDwWlJtJXD72ZnXPBW3wgCh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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