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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a35d188e37b1af78cad4149335baabe93461a02b783efb015cdff6d91309fca' 
  AND token = 'emJI/lknN0yCosiVuvO5ody+v77w11iuT8jgZoVuI7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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