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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a55c08200075ca9fbf8d52a057f6d8fb3001486ecafa28df8831db71635442c2' 
  AND token = 'jxuiKeJsuWq3qfWi5BVLSrvMEPDZ86qchv2WAba8n3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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