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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeb574847a1ac6b3831aced97c6e9403a9a045253480cc17524c0cb14dea20c2' 
  AND token = '2oLEmj4dRYAmo5TMVil1w/WsC9G2OSIwOqeF2QfpgWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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