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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f0db84c97847580a7e0589161fa2717d277d6796be77efc1d1ec6dd7e144c2f' 
  AND token = '6R2JiddANzs2iFAD2d7+jIse2Zx6J683gjww1Cq40JY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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