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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b76892dfd11daf4bfe18bd27441f91374ab644e1baee216e2d8abf915a55d5f' 
  AND token = 'kwD602qRrvOS2j4WoiE3rCuwiqkItUeyggsXy7Un8oY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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