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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38113b748155078b1e9cbb774669e6582cb5f248f4ab0688a0ad5bc499fe05a6' 
  AND token = '/ku3V4AhKl3eBKysenAYhNnezAOFD8kpVzGO+UebVlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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