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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e79d11b2a7a42f68f4ce88f340ce4299f7435b7b9cfb1b0e3d0e364031f830e2' 
  AND token = 'pYiPanVXjsES/hyys74TbubRth99qZzOskllZSvVLiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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