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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a92cb6ea41a651b869b3cfbad89dc500dd11bbd5170e111fba4119aaceb1df53' 
  AND token = 'OTKTGRWy054DfYo0i+Z5bfhuYFKP5H/Se3blR82T7/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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