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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c783070410a2722422dee7485e49efd30672fee54fe66c5b453a4d0a6949372e' 
  AND token = 'vsG7K9/TBndSDFJ1ykebT9ywRM1hlzo6CxyyzhZ+0os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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