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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23836de7c829025b55073cc518745b9c217cda055127d548aab6eafffdd6451f' 
  AND token = 'Ay5yQDs2fkDq9pBMACqyO37JOS36eXcv2DTSH37sqcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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