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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73a9269f4a5ff95f8feadd7ae6595c8750a655cd8f2860c2ac5a76ecde89b77d' 
  AND token = 'mbzs9nk9hckrWiHyxJa8Gh7hBZMiDAES+SLCtbACw7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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