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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '032936ddd76bfb46edb1ae3671911245e7369b47b9f32a718628fdb211105f22' 
  AND token = 'SW8MV3d2QzkP461+kwew21lYe2/0k4mKUnAQ6opd5BE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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