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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b137537ffd52913cc903ac23f68e287c09a87e4edf12b1c7df02936778b7664d' 
  AND token = 'eIHiq3ThYZisuLm+9nb/2tJsasLKVm99N86OW2eb2b8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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