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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '010366c4d569868a02ca0ea6cceb94ea4323903951d95b151a2833d9e064078a' 
  AND token = '52W38gCN5serboZtMHOEdkpjys7XALbPy/f1Ear0Vjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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