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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fcadc8b8925053e99aceaebb6199b1654eeaaf3652184c1373daa2053cbc338' 
  AND token = 'JUxAkSJTRAYdtIwXeNl5ZOvM8Iqj4a1Cbddnq+73+lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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