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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1987e59992d7b8134bcece5c14db873183e8f4d2b2833c1a66d2ab82bad0e8cb' 
  AND token = 'DSLFSDspIJSNyt9Q0BEVauwmzklxDtkmT33zezRyXSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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