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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '394544dbfa5d355cfba44e1aa02411996169de45785afae811c7c38849c3c3bf' 
  AND token = 'L8C7OQSH4nP6Q4Qh1oMpM8ccqYoRoJSaZGRVdXUVC3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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